package me.frank.security.validate.code;

import me.frank.security.properties.SecurityProperties;
import org.springframework.beans.factory.annotation.Autowired;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;

/**
 * @Author Frank Wang
 * @Description:图形验证码生成器
 * @Date 2018/12/12 10:31
 */
public class ImageCodeGenerator implements ValidateCodeGenerator{

        @Autowired
        private SecurityProperties securityProperties;


        // 验证码
        private String code = null;
        // 验证码图片Buffer
        private BufferedImage buffImg = null;

        // 验证码范围,去掉0(数字)和O(拼音)容易混淆的(小写的1和L也可以去掉,大写不用了)
        private char[] codeSequence = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
                'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
                'X', 'Y', 'Z', '1', '2', '3', '4', '5', '6', '7', '8', '9'};

        public void createCode() {

            // 图片的宽度。
             int width = securityProperties.getCode().getImage().getWidth();
            // 图片的高度。
             int height = securityProperties.getCode().getImage().getHeight();
            // 验证码字符个数
             int codeCount = securityProperties.getCode().getImage().getLength();
            // 验证码干扰线数
             int lineCount = 150;

            int x = 0, fontHeight = 0, codeY = 0;
            int red = 0, green = 0, blue = 0;

            x = width / (codeCount + 2);//每个字符的宽度(左右各空出一个字符)
            fontHeight = height - 2;//字体的高度
            codeY = height - 4;

            // 图像buffer
            buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics2D g = buffImg.createGraphics();
            // 生成随机数
            Random random = new Random();
            // 将图像填充为白色
            g.setColor(Color.WHITE);
            g.fillRect(0, 0, width, height);
            // 创建字体,可以修改为其它的
            Font font = new Font("Fixedsys", Font.PLAIN, fontHeight);
//        Font font = new Font("Times New Roman", Font.ROMAN_BASELINE, fontHeight);
            g.setFont(font);

            for (int i = 0; i < lineCount; i++) {
                // 设置随机开始和结束坐标
                int xs = random.nextInt(width);//x坐标开始
                int ys = random.nextInt(height);//y坐标开始
                int xe = xs + random.nextInt(width / 8);//x坐标结束
                int ye = ys + random.nextInt(height / 8);//y坐标结束

                // 产生随机的颜色值，让输出的每个干扰线的颜色值都将不同。
                red = random.nextInt(255);
                green = random.nextInt(255);
                blue = random.nextInt(255);
                g.setColor(new Color(red, green, blue));
                g.drawLine(xs, ys, xe, ye);
            }

            // randomCode记录随机产生的验证码
            StringBuffer randomCode = new StringBuffer();
            // 随机产生codeCount个字符的验证码。
            for (int i = 0; i < codeCount; i++) {
                String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);
                // 产生随机的颜色值，让输出的每个字符的颜色值都将不同。
                red = random.nextInt(255);
                green = random.nextInt(255);
                blue = random.nextInt(255);
                g.setColor(new Color(red, green, blue));
                g.drawString(strRand, (i + 1) * x, codeY);
                // 将产生的四个随机数组合在一起。
                randomCode.append(strRand);
            }
            // 将四位数字的验证码保存到Session中。
            code = randomCode.toString();
        }

        public void write(String path) throws IOException {
            OutputStream sos = new FileOutputStream(path);
            this.write(sos);
        }

        public void write(OutputStream sos) throws IOException {
            ImageIO.write(buffImg, "JPEG", sos);
            sos.close();
        }

        public BufferedImage getBuffImg() {
            return buffImg;
        }

        public String getCode() {
            return code;
        }

    @Override
    public ValidateCode generate() {

        this.createCode();
        ImageValidateCode imageValidateCode=new ImageValidateCode( this.getBuffImg(),this.getCode(),securityProperties.getCode().getImage().getExpire());
        return imageValidateCode;
    }

    //用户配置
    public void setSecurityProperties(SecurityProperties securityProperties) {
        this.securityProperties = securityProperties;
    }

    public SecurityProperties getSecurityProperties() {
        return securityProperties;
    }
}
